Search
Menu

Explore

Hazards

Analysis

Rankings

Reference

Left Hand Creek (CO) below Jamestown

Highest listed crest 4.60 ftFlood stage 4.5 ft2 crests since 1999

The Left Hand Creek (CO) below Jamestown crested above flood stage 1 time among the 2 crests the National Weather Service lists from 1999 to 2004. The highest, 4.60 ft on April 30, 1999, was minor flooding, 0.10 feet above flood stage.

The gauge

Highest listed crest
4.60 ft
April 30, 1999; 720 cubic feet per second
Flood stage
4.5 ft
Major flooding from 6.0 ft
Crests at major
0
1 above flood stage
Most recent flood crest
April 30, 1999
4.60 ft, minor flooding
Location
Boulder County
Near Boulder (7.3 mi), Longmont (13.1 mi), Louisville (14.0 mi)
Identifiers
NWS LLHC2
No USGS station

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Left Hand Creek (CO) below Jamestown
Action stage4.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)4.51Apr 30, 1999Minimal or no property damage, but possibly some public threat
Moderate flood stage5.20—Some inundation of structures and roads near the stream
Major flood stage6.00—Extensive inundation of structures and roads

Every listed crest

2 crests from 1999 to 2004. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Left Hand Creek (CO) below Jamestown, 1999 to 2004 3456ft Flood stage 4.5 ftMajor 6.0 ft Apr 30, 1999: 4.60 ft, minor flooding; 720 cubic feet per secondJul 23, 2004: 3.24 ft, below flood stage; 298 cubic feet per second Highest, 4.60 ft, Apr 30, 1999 20002005

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Left Hand Creek (CO) below Jamestown 1990s: 1 1 2000s: 0 1990s2000s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Left Hand Creek (CO) below Jamestown
1Apr 30, 19994.60+0.10Minor720
2Jul 23, 20043.24−1.26Below flood stage298

Other gauges in Boulder County

Flood gauges in Boulder County
North 75TH St.8.010.60 ft, Sep 13, 20131
Broadway St8.08.18 ft, Sep 12, 20130
Nederland5.55.50 ft, Jun 22, 19950
Orodell4.04.31 ft, Jun 6, 19210
Nederland4.55.37 ft, Jun 2, 19140
Lyons8.013.00 ft, Sep 12, 20131
Eldorado Springs5.05.43 ft, Sep 12, 20130
Lyons6.06.50 ft, May 29, 19950

Boulder County: every hazard · River floods across the country · Colorado

NOAA National Water Prediction Service, gauge LLHC2, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.